Abstract: Ecological mapping is to analyse the spatial patterns and the relationships of vegetation and ecological factors with the aid of graph. The use of geographic information system (GIS) for ecological mapping makes vegetation ecology develop from qualitative analysis to quantitative and graphical analysis and image processing. This paper introduces the establishment of the ecological mapping system of the Ordos Grassland Station using EPPL7 GIS software, and the automatic production of the potentical desertification map, the ecological planning map for vegetation, the integrated ecological map and the desertification monitoring map of the Ordos Grassland Station.